/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package org.openqa.selenium.support;

import org.openqa.selenium.By;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Field;

/**
 * <p>Used to mark a field on a Page Object to indicate an alternative mechanism for locating the
 * element or a list of elements. Used in conjunction with
 * {@link org.openqa.selenium.support.PageFactory}
 * this allows users to quickly and easily create PageObjects.</p>
 *
 * <p>It can be used on a types as well, but will not be processed by default.</p>
 *
 * <p>
 * You can either use this annotation by specifying both "how" and "using" or by specifying one of
 * the location strategies (eg: "id") with an appropriate value to use. Both options will delegate
 * down to the matching {@link org.openqa.selenium.By} methods in By class.</p>
 *
 * <p>For example, these two annotations point to the same element:</p>
 *
 * <pre class="code">
 * &#64;FindBy(id = "foobar") WebElement foobar;
 * &#64;FindBy(how = How.ID, using = "foobar") WebElement foobar;
 * </pre>
 *
 * <p>and these two annotations point to the same list of elements:</p>
 *
 * <pre class="code">
 * &#64;FindBy(tagName = "a") List&lt;WebElement&gt; links;
 * &#64;FindBy(how = How.TAG_NAME, using = "a") List&lt;WebElement&gt; links;
 * </pre>
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.TYPE})
@PageFactoryFinder(FindBy.FindByBuilder.class)
public @interface FindBy {
  How how() default How.UNSET;

  String using() default "";

  String id() default "";

  String name() default "";

  String className() default "";

  String css() default "";

  String tagName() default "";

  String linkText() default "";

  String partialLinkText() default "";

  String xpath() default "";

  public static class FindByBuilder extends AbstractFindByBuilder {
    public By buildIt(Object annotation, Field field) {
      FindBy findBy = (FindBy) annotation;
      assertValidFindBy(findBy);

      By ans = buildByFromShortFindBy(findBy);
      if (ans == null) {
        ans = buildByFromLongFindBy(findBy);
      }

      return ans;

    }

  }

}
